access icon openaccess Investigation of wire insulation for high-temperature motor windings

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 22/06/2018, Accepted 31/07/2018, Published 22/01/2019

There is a strong interest in the development of high-temperature electrical machines, both from academic research and industrial consumers. Conventional electrical machines cannot operate much beyond 250 ° C, and this limits their application in certain sectors such as oil, gas, and aerospace. The key technology for high-temperature operation is high-temperature wire insulation systems for the motor windings. This study presents an experimental study on the temperature dependence of the wire insulation resistance of a standard Class H (180°C) enamel wire, a high-temperature MAGNETEMP CA-200 wire, a photonis glass-coated wire, a mica-taped VonRoll SK650 wire, a ceramic-based CERAFIL500 wire, and a newly developed S-2 glass-fibre insulated wire. The results show that motor operation above ∼300°C for any length of time using conventional polymer-based wire is difficult. It is possible, however, to operate motors up to 600°C using inorganic insulation coatings. The new wire using the S-2 glass-fibre insulation performed very well showing good insulation resistance up to 600°C: excellent flexibility and robustness, capable of very small bend diameters, and with packing factors almost identical to the conventional copper wire.

Inspec keywords: copper; electric motors; polymer films; organic insulating materials; insulating coatings; enamels; insulated wires; mica; ceramics; machine insulation; glass fibre reinforced plastics

Other keywords: conventional electrical machines; high-temperature MAGNETEMP CA-200 wire; conventional copper wire; high-temperature operation; temperature dependence; good insulation resistance; ceramic-based CERAFIL500 wire; inorganic insulation coatings; temperature 250.0 degC; motor operation; high-temperature electrical machines; temperature 180.0 degC; conventional polymer-based wire; S-2 glass-fibre insulation; temperature 300.0 degC; temperature 600.0 degC; standard Class H enamel wire; photonis glass-coated wire; wire insulation resistance; high-temperature wire insulation systems; high-temperature motor windings; S-2 glass-fibre insulated wire; mica-taped VonRoll SK650 wire

Subjects: Organic insulation; d.c. machines; a.c. machines; Inorganic insulation; Wires and cables

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